Pulmonary Tree

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Breathing and Exchange of Gases

Bronchi and Bronchioles: 
 On entering the mid thoracic cavity, treachea divides at the level of the 5th thoracic vertebra into right and left primary bronchi.. each primary bronchus enters the corresponding lung and divides into secondary bronchi that further divide into tertiary bronchi. Each tertiary bronchus divides and redivides to form primary, secondary, tertiary terminal and respiratory bronchiles sequentially. Each respiratory bronchile terminates in a cluster of alveolar ducts. 





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